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a in (-oo:+oo)
4/9 = (8/11)*a // - (8/11)*a
4/9-((8/11)*a) = 0
(-8/11)*a+4/9 = 0
4/9-8/11*a = 0 // - 4/9
-8/11*a = -4/9 // : -8/11
a = -4/9/(-8/11)
a = 11/18
a = 11/18
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